User development, A new message was posted in the thread "Problem deploying EJB 3.0 jar to JBoss 5.0.1 GA": http://community.jboss.org/message/522291#522291 Author : Wolfgang Knauf Profile : http://community.jboss.org/people/WolfgangKnauf Message: -------------------------------------------------------------- Sorry, I didn't see that you were talking about 5.0.1 and not 5.1.0 ;-).   It seems that "DefaultDS" is missing in your 5.0.1 setup:         Maybe you should start from a fresh 5.0.1 installation and redo your changes.   Wolfgang -------------------------------------------------------------- To reply to this message visit the message page: http://community.jboss.org/message/522291#522291